Add GPU signing interface

Add a new entrypoint ed25519_sign_many to support signing on the GPU and share the execution contexts with the verify path.

v0.15.0

Add cudaHostRegister and cudaHostUnregister passthrough

v0.14.1

libcuda-crypt.so is now a real shared object; don't ship libcuda-cryp…

CUDA 10.1 support

v0.14.0

Add libcuda-crypt.so

Initial SGX enclave for signing

Added test for signing via SGX enclave (#28)

* Added test for signing via SGX enclave

* fix compile errors

* address review comments, fix build

* Fix compile error

- also updated docker image

Init fix

Add optional ed25519_init() (#10)

This function permits ed25519_verify_many() users to ensure the GPU is
initialized correctly and if not take action rather than having the failure
suppressed.

ed25519_verify_many() retains its previous behavior of implicit initialization
if ed25519_init() is not explicitly called.

Retransmit index added to packet header

v0.6.0

Include CUDA version in perf tarball

v0.5.0

Fix debug build

v0.5.0-beta

Add AGPL 3 license